The perfect wrench for the locknuts on threaded Headsets especially those in aluminium The thickness makes for a large contact area preventing the locknut from being marred or rounded off The semi-box opening allows the tool to be slid past the stem before dropping down onto the locknut Suitable for any locknut with 8 flats with a 32 mm end for 1 inch Headsets & 36 mm end for 1-1/8 inch Headsets Made from investment cast steel